Some
possible drills:Fly.
Kick, no board, arms at body's side. Think: kick head down, kick
head up. Don't rush the kick. It begins at the chest and unfurls
quite slowly with a snap of the ankles, like cracking a whip. If
your timing is good on the whole stroke, this will be very easy.
If it's difficult to do, probably your timing is off. Within a fraction
of a second, the sequence of entry is head, hands, feet. The second
kick is half way through the stroke.

Back. Swim with exaggerated roll and glide on your
side, one arm outstretched and one at your side for about 6 to 9
kicks.

Breast.
Kick twice, pull once for a length; then kick once
and pull twice. Swim using fly kick.

Free.
One-arm, catch-up (hand touches outstretched hand before you pull),
ripple (drag your fingers in the water, directly below your elbow,
during recovery), hesitation (leave your hand out of the water behind
you for a second before beginning recovery.